For 0 lt theta lt pi/2 , the solution (s...

For `0 lt theta lt pi/2` , the solution (s) of `sum_(m=1)^6cos e c(theta+((m-1)pi/4)) cos e c(theta+(mpi)/4) = 4sqrt(2) is(a r e)` (a) `pi/4` (b) `pi/6` (c) `pi/(12)` (d) `(5pi)/(12)`

A

`(pi)/(4)`

B

`(pi)/6`

C

`(pi)/(12)`

D

`(5pi)/(12)`

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The correct Answer is:

C, D

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